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We installed a purpose‐built network of co‐located Global Navigation Satellite System (GNSS) stations and meteorological instrumentation to investigate water storage in a high‐mountain watershed along the Idaho‐Montana border. Twelve GNSS stations are distributed across the Selway‐Lochsa watersheds at approximately 30–40 km spacing, filling a critical observational gap between localized point measurements and regional geodetic and satellite data sets. The unique coupling of geodetic and hydrologic observations in this network enables direct comparison between co‐located GNSS measurements of the elastic response of the solid Earth and local changes in measured water storage. This network is specifically designed to address questions of hydrologic storage and movement at the mountain watershed scale. Here, we describe technical details of the network and its deployment; introduce new hydrologic, meteorologic, and geodetic data sets recorded by the network; process and analyze the source data (e.g., time series of daily three‐dimensional GNSS site positions, removal of non‐hydrologic signals); and characterize basic empirical relationships between water storage, water movement, and GNSS‐inferred surface displacement. The network shows preliminary evidence for spatial differences in displacement resulting from a range of snow loads across elevations, but longer and more complete data records are needed to support these initial findings. We also provide examples of additional scientific applications of this network, including estimations of snow depth and snow water equivalent from GNSS multipath reflectometry. Finally, we consider the challenges, limitations, and opportunities of deploying GNSS and weather stations at high elevations with heavy snowpack and offer ideas for technical improvements. Plain Language Summary: We have installed a network of co‐located weather and high‐precision Global Navigation Satellite System (GNSS) stations in and around a mountain watershed along the border of Idaho and Montana. This network is designed specifically to address questions related to local water availability, such as where and how much water is stored in the form of snowpack, surface water, groundwater, soil moisture, etc., throughout the year. By measuring the vertical motion of GNSS stations attached to bedrock, we can use Earth's surface as a giant scale to weigh the amount of this stored water. Meteorological instrumentation provides an independent measurement of water stored in the study area, enabling comparison of GNSS‐recorded movement and changing amounts of water. We show initial time series from the meteorological and GNSS stations within the network, showing how changing water storage influences GNSS vertical movement. We also provide brief examples of additional uses of this network, including the use of ground‐reflected GNSS signals to estimate snow depth and snowpack water content. Key Points: We introduce a custom network of co‐located Global Navigation Satellite System (GNSS) and meteorological stations designed to study water storage in a high‐mountain watershedThe network fills a gap in continuous GNSS‐based solid Earth deformation monitoring in the northern Intermountain WestWe record differences in surface displacement and observed hydrologic loading across the network at high spatial resolution [ABSTRACT FROM AUTHOR]